mount.h 文件参考

浏览源代码.

结构体
struct	Mount
	举例: mount /dev/mmcblk0p0 /bin1/vs/sd vfat 将/dev/mmcblk0p0 挂载到/bin1/vs/sd目录 更多...
struct	MountOps
	挂载操作 更多...

类型定义
typedef int(*	foreach_mountpoint_t) (const char *devpoint, const char *mountpoint, struct statfs *statbuf, void *arg)

函数
struct Mount *	MountAlloc (struct Vnode *vnode, struct MountOps *mop)
LIST_HEAD *	GetMountList (void)
	获取装载链表,并初始化 更多...
int	foreach_mountpoint (foreach_mountpoint_t handler, void *arg)
int	ForceUmountDev (struct Vnode *dev)

类型定义说明

foreach_mountpoint_t

typedef int(* foreach_mountpoint_t) (const char *devpoint, const char *mountpoint, struct statfs *statbuf, void *arg)

在文件 mount.h 第 96 行定义.

函数说明

ForceUmountDev()

int ForceUmountDev

(

struct Vnode *

dev

)

在文件 vfs_force_umount.c 第 451 行定义.

{
    int ret;
    struct Vnode *origin = NULL;
    struct filelist *flist = &tg_filelist;
    if (dev == NULL) {
        return -EINVAL;
    }
 
    (void)sem_wait(&flist->fl_sem);
    VnodeHold();
 
    struct Mount *mnt = GetDevMountPoint(dev);
    if (mnt == NULL) {
        VnodeDrop();
        (void)sem_post(&flist->fl_sem);
        return -ENXIO;
    }
    origin = mnt->vnodeBeCovered;
 
    FileDisableAndClean(mnt);
    VnodeTryFreeAll(mnt);
    ret = mnt->ops->Unmount(mnt, &dev);
    if (ret != OK) {
        PRINT_ERR("unmount in fs failed, ret = %d, errno = %d\n", ret, errno);
    }
 
    LOS_ListDelete(&mnt->mountList);
    free(mnt);
    origin->newMount = NULL;
    origin->flag &= ~(VNODE_FLAG_MOUNT_ORIGIN);
 
    VnodeDrop();
    (void)sem_post(&flist->fl_sem);
 
    return OK;
}

函数调用图:

这是这个函数的调用关系图:

foreach_mountpoint()

int foreach_mountpoint	(	foreach_mountpoint_t	handler,
		void *	arg
	)

这是这个函数的调用关系图:

GetMountList()

LIST_HEAD * GetMountList

(

void

)

获取装载链表,并初始化

在文件 mount.c 第 71 行定义.

{
    if (g_mountList == NULL) {
        g_mountList = zalloc(sizeof(LIST_HEAD));//分配内存, 小内存分配用 zalloc
        if (g_mountList == NULL) {
            PRINT_ERR("init mount list failed, no memory.");
            return NULL;
        }
        LOS_ListInit(g_mountList);//初始化全局链表
    }
    return g_mountList;//所有文件系统的挂载信息
}

函数调用图:

这是这个函数的调用关系图:

MountAlloc()

struct Mount * MountAlloc	(	struct Vnode *	vnode,
		struct MountOps *	mop
	)

在文件 mount.c 第 48 行定义.

{
    struct Mount* mnt = (struct Mount*)zalloc(sizeof(struct Mount));//申请一个mount结构体内存,小内存分配用 zalloc
    if (mnt == NULL) {
        PRINT_ERR("MountAlloc failed no memory!\n");
        return NULL;
    }
 
    LOS_ListInit(&mnt->activeVnodeList);//初始化激活索引节点链表
    LOS_ListInit(&mnt->vnodeList);//初始化索引节点链表
 
    mnt->vnodeBeCovered = vnodeBeCovered;//设备将装载到vnodeBeCovered节点上
    vnodeBeCovered->newMount = mnt;//该节点不再是虚拟节点,而作为 设备结点
#ifdef LOSCFG_DRIVERS_RANDOM    //随机值   驱动模块
    HiRandomHwInit();//随机值初始化
    (VOID)HiRandomHwGetInteger(&mnt->hashseed);//用于生成哈希种子
    HiRandomHwDeinit();//随机值反初始化
#else
    mnt->hashseed = (uint32_t)random(); //随机生成哈子种子
#endif
    return mnt;
}

函数调用图:

这是这个函数的调用关系图: